SAN FRANCISCO -- Gregor Blanco didn't even have time to take practice swings in the indoor cage before he stepped into the batter's box as a pinch hitter in the fifth inning Saturday.

Turns out, he didn't need any.

Blanco cleared the bases with a three-run double to deep right-center field, breaking open a tight game as the Giants cruised to a 10-1 victory over the Atlanta Braves at AT&T Park behind another pitching gem from Madison Bumgarner.

The left-hander bounced back from his first rough outing of the season to silence the aggressive-hitting Braves, allowing one run and striking out a season-high 11 in seven innings.

The Giants rewarded him with the most run support he has received in any game this season.

"He has thrown so well this year," manager Bruce Bochy said. "He was on top of his game, hit his spots. It's a tough lineup to go through, and he did quite a job for us."

Blanco's double gave the Giants a 6-1 lead. He added a run-scoring triple in the eighth for his fourth RBI of the game, a career high.

Bochy called Blanco's fifth-inning double a "huge at-bat."

"It was tight ballgame at that point, and he helped break it open there," Bochy said. "Great at-bat. He hit a three-run double, and that's what you're looking for at that point. He delivered for us."

Blanco, who is hitting .287, said he didn't expect to be called on at that point. But when the Braves turned to right-hander Cory Gearrin after the Giants chased starter Paul Maholm (4-4), Bochy summoned the left-handed hitter.

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"I was just on the bench, watching the game and enjoying Bumgarner pitching," Blanco said. "I didn't stretch. I didn't make a swing. It was pretty much from the bench to that swing."

Given the way Bumgarner was mowing down the Braves, Blanco's big swing pretty much was the knockout blow.

Bumgarner, who allowed five runs in six innings Monday against Philadelphia, retired the first 11 Atlanta batters before Justin Upton reached on an infield single into the hole at shortstop.

Atlanta Braves' Justin Upton (8) beats the throw to first base from San Francisco Giants shortstop Brandon Crawford to first baseman Buster Posey, left, for an infield single during the fourth inning of a baseball game on Saturday, May 11, 2013, in San Francisco. (AP Photo/Marcio Jose Sanchez)
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Marcio Jose Sanchez
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It was one of the few bumps for Bumgarner (4-1) on the day as he won for the first time since beating the Cubs at Wrigley Field on April 13. Bumgarner allowed four hits and two walks while lowering his ERA to 2.18.

"They swing a lot and swing hard, so you try to keep mixing it up and keep making good pitches, and that's what we were able to do," Bumgarner said.

The Giants took a 1-0 lead in the first when Pablo Sandoval sent a 3-2 pitch from Maholm into the left-field seats. Brandon Crawford stretched the Giants' lead to 2-0 in the fourth, shooting a double down the left-field line to drive in a run.

After the Braves made it 2-1 in the fifth, the Giants ended Maholm's day with help from Upton. Upton misplayed Marco Scutaro's fly ball to right field, allowing it to roll toward the wall for a triple.

Maholm then hit Sandoval on the right forearm, and Buster Posey followed with a deep fly to right. Upton got turned around on the blast and made a desperation leap on the warning track. The ball missed Upton's glove, giving Posey a run-scoring double.

Two batters later, Blanco broke it open.

"That's nice," Bumgarner said. "It makes it a lot easier to go out there and try to get ahead and throw strikes and let the defense work whenever you have a pretty big lead."

Sandoval had X-rays on his forearm after being removed from the game in the eighth inning. "He's fine," Bochy said. "I'm sure he is going to be a little sore. I'll check on him tomorrow to see if he's available."

Right-handed reliever Santiago Casilla was feeling better, but his status remains day-to-day, Bochy said. "He's eager to get out there, so I probably can answer this better tomorrow after he gets treatment," the manager added. Casilla has a cyst in his right knee and has been unavailable since pitching Wednesday.